Per capita chicken consumptionWeChat monthly active users
As Americans have eaten more chicken per capita, WeChat has gained more monthly active users in China, a correlation of 0.984 that connects American poultry habits to Chinese messaging habits across the Pacific with the cross-cultural confidence of a chart that does not own a passport. The chicken is consumed in Memphis, the message is sent in Shenzhen, and both numbers climb because growing populations in growing economies consume more of everything.
Chicken consumption grew to over 98 pounds per capita. WeChat grew to over 1.3 billion users. Both are smooth growth curves in their respective markets: chicken because it is the cheapest protein in America, WeChat because it is the essential app in China. Ten data points, both up, driven by completely different forces in completely different countries. The shared variable is global economic growth in the 2010s.
Ten years of chicken and WeChat is a correlation that spans the Pacific and means nothing on either shore. Americans eat more chicken because it is cheap and versatile, Chinese users message more because WeChat is indispensable, and the chart connects them with the geographical indifference of a coefficient that has never tasted General Tso's.
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Want to learn more about why correlations like “Per capita chicken consumption” vs “WeChat monthly active users” don't prove causation? Read our guide to statistical thinking.